測定2色温度と真温度の関係
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概要
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When two-color pyrometers are used in order to determine the true temperature of a subject, the difference between a calculated true temperature (T'), which is calculated from the measured two-color temperature by using two effective wavelengths, and the true temperature (T), in other words, "a range of the absolute value in error calculated (ΔT)", is very important in discussing the practicality of the two-color pyrometer.The effects which the spectral characteristic of two-color pyrometer i.e. the measured band width of wavelength has on ΔT above mentioned were discussed.The measured band width of wavelength determined by the spectral characteristic of the detector and the filters is classified into a narrow, a medium, and a broad bands. In spite of the change of the temperature and the spectral emissivity of the object, the narrower is the measured band width of wavelength, the smaller are the shift of the effective wavelengths and ΔT. But the medium band two-color pyrometer proves to be fully practical in accuracy to determine the true temperature. If there is the absorption band attenuating the measured light of a certain wavelength in the measuring light path having consideration for the practical measuring condition, it directly causes ΔT to be larger.On the other hand, the broader is the measured band width of wavelength, the larger is ΔT. The examinations of the general expression to reduce ΔT bring us only a too troublesome one for practicality. ΔT, however, isnot liable to be effected by the absorption band of the measuring light path in using the broad band two-color pyrometer. Then the intense signal can be obtained.Consequently, it is advantageous to broaden as much the measured band width of wavelength as possible within range where ΔT can be practically neglected; and the band width is proper when the characteristic obtained by composing the spectral characteristic of the filters and of the detector is approximated to an equilateral triangle, and its half band width is set up about 0.08μm and then the measured band width of wavelength is about 0.16∼0.20μm (medium band).
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